Genetical and biochemical basis of cotton leaf curl virus disease in Gossypium hirsutum L.
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Date
2014
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CCSHAU
Abstract
The present investigation comprising six generation (Parents, F1, F2, BC1 and BC2) of four crosses in
cotton viz. H1098-I x B 59-1678, H 1117 x HS6, H 1098-I x H1117 and B 59-1678 x HS6 was conducted for
studying the inheritance of cotton leaf curl virus disease and estimating the gene effects for the yield and its
component traits during kharif 2013 at the experimental area of the Department of Genetics & Plant Breeding,
CCS Haryana Agricultural University, Hisar, India. The inheritance of cotton leaf curl virus disease indicated the duplicate dominant epistasis(15:1). No complimentary gene action was observed in cross with susceptible parents. Generation mean analysis revealed significant differences for all traits where the A, B, C and D individual scales were also significant for most of the characters indicating thereby the presence of non-allelic interactions. In some
of the cases, the non-significance of chi-square value indicated the fitness for additive-dominance model. Additive component was significant for most of the characters and even as preponderant in magnitude over the dominance component. Either all or any of the three types of epistatic interactions (i, j and l) were significant for most of the cases and generally it is the “i" type of interaction which is more frequently prevailing for most of the traits studied
over the crosses. However, the magnitude and direction of estimates changed for the cross. Additive x additive type of interaction was recorded for plant height, boll number, boll weight,GOT, seed index and seed cotton yield. Duplicate type of interaction was apparent for plant height, boll number, boll weight, GOT and lint index.
Complementary type of interaction was recorded for plant height. Significant heterosis was observed for plant height, boll weight, seed index. The magnitude and direction of heterosis was varying from cross to cross. Among biochemical parameters, sugar content was higher in susceptible parents than resistant ones. Also, it decreased at 90 DAS when the disease incidence was higher and further increase at 120 DAS. Phenol, tannin and gossypol content, the secondary metabolites were higher in resistant parents as compared to susceptible parents. Concentration was more at 90 DAS which decrease at 120 DAS. Protein and cellulose concentration was gradually decrease and increase with days after sowing respectively. Correlation matrix indicated that cotton leaf curl virus disease grading was significant positively correlated with the sugar content and negatively correlated with phenol, tannin, gossypol, protein and cellulose, while oil content did not indicated any correlation with CLCuD grading irrespective of crosses and Days after sowing.
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Keywords
Crossing over, Cotton, Diseases, Planting, Genes, Genetics, Sowing, Additives, Phenols, Aromatic compounds